Difference between contactor and relay
Contactors and relays are two closely related terms leading to confusions and misinterpretations most of the times. Both of them are electrically operated switches used for control and switching of…
What is ammeter selector switch?
Ammeter selector switch is basically a normal three position switch. In large Electrical distribution panels, an ammeter is used to monitor the current through each line. (more…)
Why are current transformers used in power system?
Why are current transformers used in power system? Protective relays coils and measuring instruments such as an ammeter, watt meter and energy meter are very sensitive devices and cannot be…
What are the basic requirements of a protection system used in a power network or equipment?
The following are the basic requirements of any power system protection system: ReliabilitySimplicitySelectivitySensitivitySpeed of operationEconomy Circuit breaker
What are the essential components of a protective relay?
What are the essential components of a protective relay? The essential components of a protective relay are the following: 1. Sensing element. 2. Comparison element. 3. Control element Related…
What are the main functions of a protection relay?
What are the main functions of a protection relay? The main functions of a protective relay are the following: · Detection of the presence of a fault. · Detection of…
What is a protection relay?
What is a protection relay? Protection relay is an electrical device used to sense an abnormal condition in a power system and operate a circuit breaker…
How rating of a circuit breaker for a system is determined?
How rating of a circuit breaker for a system is determined? The rating of a circuit breaker for a system is determined based on the balanced three phase fault…
